Just to play devil's advocate here, this is from the article: > The app, called WorkIt, invites users to register by providing a name, email, telephone number and ZIP Code. Users can also s hare (sic) their job title and Wal-Mart store number.... That is a bunch of personally identifying information. You can easily steal somebody's identity with those bits of information, or at least have a good idea of who they are.…
Yes. Of course. Isn't that the definition of "register"? It means to input your identifying information.
Cf. First definition under intransitive verb (the sense used here): http://www.merriam-webster.com/dictionary/register